<template>
  <div class="article-container">
    <!-- 评论的评论列表 -->
    <van-popup
      v-model="commentttShow"
      position="bottom"
      :style="{ height: '100%' }"
    >
      <reply-comment
        :art_id="article.art_id"
        @return="commentttShow=false"
        :data="lookCommentData"
      ></reply-comment>
    </van-popup>
    <!-- 导航栏 -->
    <van-nav-bar
      class="page-nav-bar"
      left-arrow
      title="黑马头条"
      @click-left="onClickLeft"
    ></van-nav-bar>
    <!-- /导航栏 -->

    <div class="main-wrap">
      <!-- 加载中 -->
      <div
        class="loading-wrap"
        v-if="isShowLoading"
      >
        <van-loading
          color="#3296fa"
          vertical
        >加载中</van-loading>
      </div>
      <!-- /加载中 -->

      <!-- 加载完成-文章详情 -->
      <div
        class="article-detail"
        v-else-if="article"
      >
        <!-- 文章标题 -->
        <h1 class="article-title">{{article.title}}</h1>
        <!-- /文章标题 -->

        <!-- 用户信息 -->
        <van-cell
          class="user-info"
          center
          :border="false"
        >
          <van-image
            @click="$router.push('/user/'+article.aut_id)"
            class="avatar"
            slot="icon"
            round
            fit="cover"
            :src="article.aut_photo"
          />
          <div
            slot="title"
            class="user-name"
          >{{article.aut_name}}</div>
          <div
            slot="label"
            class="publish-date"
          >{{article.pubdate|relativeTime}}</div>
          <!-- 关注按钮 -->
          <followed-btn
            v-model="article.is_followed"
            :aut_id="article.aut_id"
            class="follow-btn"
          ></followed-btn>
        </van-cell>
        <!-- /用户信息 -->

        <!-- 文章内容 -->
        <div
          ref="article-content"
          class="
            article-content markdown-body"
          v-html="article.content"
        >
        </div>
        <van-divider>正文结束</van-divider>
        <!-- 评论列表 -->
        <comment-list
          @re-comment="lookComment"
          :list="commentList"
          :needId="article.art_id"
          type="a"
          @comment="total=$event.total_count"
        >
        </comment-list>
        <!-- 评论列表 -->

        <!-- 底部区域 -->
        <div class="article-bottom">
          <van-button
            class="comment-btn"
            type="default"
            round
            size="small"
            @click="commentShow=true"
          >写评论</van-button>
          <!-- 写评论弹出层 -->
          <van-popup
            v-model="commentShow"
            close-icon-position="top-left"
            position="bottom"
            style=" height: 20%;padding:5px"
          >
            <van-cell class="addComment">
              <van-field
                v-model.trim="message"
                rows="3"
                autosize
                type="textarea"
                maxlength="50"
                placeholder="请输入评论"
                show-word-limit
                slot="title"
              />
              <van-button
                :disabled="!message"
                @click="addComment"
                type="info"
                style="margin-top:20px"
              >发送</van-button>
            </van-cell>

          </van-popup>
          <!-- 评论按钮 -->
          <van-button
            style="border:none"
            @click="watchComment"
          >
            <van-icon
              name="comment-o"
              :info="total"
              color="#777"
            />
          </van-button>
          <!-- 收藏按钮 -->
          <collected-btn
            v-model="article.is_collected"
            :art_id="article.art_id"
          ></collected-btn>
          <!-- 点赞按钮 -->
          <liked-btn
            v-model="article.attitude"
            :art_id="article.art_id"
          ></liked-btn>
          <!-- 分享按钮 -->
          <van-button
            style="border:none"
            @click="$toast('该功能暂未开发')"
          >
            <van-icon
              name="share"
              color="#777777"
            ></van-icon>
          </van-button>
        </div>
        <!-- /底部区域 -->
      </div>
      <!-- 预览图片 -->

      <!-- /加载完成-文章详情 -->

      <!-- 加载失败：404 -->
      <div
        class="error-wrap"
        v-else-if="isFour"
      >
        <van-icon name="failure" />
        <p class="text">该资源不存在或已删除！</p>
      </div>
      <!-- /加载失败：404 -->

      <!-- 加载失败：其它未知错误（例如网络原因或服务端异常） -->
      <div
        class="error-wrap"
        v-else
      >
        <van-icon name="failure" />
        <p class="text">内容加载失败！</p>
        <van-button
          class="retry-btn"
          @click="reLoading"
        >点击重试</van-button>
      </div>
      <!-- /加载失败：其它未知错误（例如网络原因或服务端异常） -->
    </div>

  </div>
</template>

<script>
import followedBtn from '@/components/followed.vue'
import collectedBtn from '@/components/collected.vue'
import likedBtn from '@/components/liked.vue'
import { getArticle } from '@/api/article.js'
import { setTimeout } from 'timers'
import { ImagePreview } from 'vant'
import commentList from './components/comment-list.vue'
import { addComments } from '@/api/comment.js'
import replyComment from '@/components/reply-comment.vue'

export default {
  name: 'ArticleIndex',
  components: {
    followedBtn,
    collectedBtn,
    likedBtn,
    commentList,
    replyComment
  },
  props: {
    articleId: {
      type: [Number, String, Object],
      required: true
    }
  },
  data () {
    return {
      article: {},
      isShowLoading: true,
      isFour: false,
      total: 0,
      commentShow: false,
      message: '',
      commentList: [],
      commentttShow: false,
      lookCommentData: null
    }
  },
  computed: {},
  watch: {},
  created () {
    this.getArticle()
  },
  mounted () {
    console.log(this.$route, this.$props)
  },
  methods: {
    // 得到文章
    getArticle: async function () {
      try {
        const { data: res } = await getArticle(this.articleId)
        this.article = res.data
        setTimeout(() => {
          this.imagePreview()
        }, 0)
      } catch (err) {
        if (err.response && err.response.status === 404) {
          this.isFour = true
        } else {
          this.isFour = false
        }
      }
      this.isShowLoading = false
    },
    // 重新加载
    reLoading () {
      this.isShowLoading = true
      this.getArticle()
    },
    // 预览图片
    imagePreview () {
      const images = this.$refs['article-content'].querySelectorAll('img')
      const image = []
      images.forEach((img, index) => {
        image.push(img.url)
        img.onclick = () => {
          ImagePreview({
            images: image,
            startPosition: index
          })
        }
      })
    },
    // 返回
    onClickLeft () {
      this.$router.back()
    },
    // 发表评论
    async  addComment () {
      this.$toast.loading({
        message: '发表中...',
        forbidClick: true
      })
      try {
        const { data: res } = await addComments({
          target: this.articleId,
          content: this.message
        })
        this.commentList.unshift(res.data.new_obj)
        this.commentShow = false
        this.message = null
        this.$toast.success('发表成功')
      } catch (err) {
        if (err.response && err.response.status === 401) {
          return this.$toast('请先登录')
        }
        this.$toast.fail('发表失败')
      }
    },
    watchComment () {
      const ref1 = document.querySelector('.main-wrap')
      const ref2 = document.querySelector('.article-content')
      ref1.scroll(0, ref2.offsetHeight)
    },
    lookComment (e) {
      console.log(e)
      this.lookCommentData = e
      this.commentttShow = true
    }
  }
}
</script>

<style scoped lang="less">
@import "./github-markdown.css";
.article-container {
  .main-wrap {
    position: fixed;
    left: 0;
    right: 0;
    top: 92px;
    bottom: 88px;
    overflow-y: scroll;
    background-color: #fff;
  }
  .article-detail {
    .article-title {
      font-size: 40px;
      padding: 50px 32px;
      margin: 0;
      color: #3a3a3a;
    }

    .user-info {
      padding: 0 32px;
      .avatar {
        width: 70px;
        height: 70px;
        margin-right: 17px;
      }
      .van-cell__label {
        margin-top: 0;
      }
      .user-name {
        font-size: 24px;
        color: #3a3a3a;
      }
      .publish-date {
        font-size: 23px;
        color: #b7b7b7;
      }
      .follow-btn {
        width: 170px;
        height: 58px;
      }
    }

    .article-content {
      padding: 55px 32px;
      /deep/ p {
        text-align: justify;
      }
    }
  }

  .loading-wrap {
    padding: 200px 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: #fff;
  }

  .error-wrap {
    padding: 200px 32px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background-color: #fff;
    .van-icon {
      font-size: 122px;
      color: #b4b4b4;
    }
    .text {
      font-size: 30px;
      color: #666666;
      margin: 33px 0 46px;
    }
    .retry-btn {
      width: 280px;
      height: 70px;
      line-height: 70px;
      border: 1px solid #c3c3c3;
      font-size: 30px;
      color: #666666;
    }
  }

  .article-bottom {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    justify-content: space-around;
    align-items: center;
    box-sizing: border-box;
    height: 88px;
    border-top: 1px solid #d8d8d8;
    background-color: #fff;
    .comment-btn {
      width: 282px;
      height: 46px;
      border: 2px solid #eeeeee;
      font-size: 30px;
      line-height: 46px;
      color: #a7a7a7;
    }
    .van-icon {
      font-size: 40px;
      .van-info {
        font-size: 16px;
        background-color: #e22829;
      }
    }
  }
}
/deep/ .addComment {
  .van-cell__value {
    flex: unset;
    width: 100px;
  }
  .van-field__value {
    background: #f5f7f9;
  }
  .van-field__value {
    flex: 1;
  }
  button {
    white-space: nowrap;
    background: rgb(255, 255, 255);
    color: rgb(0, 128, 255);
    border: none;
  }
}
</style>
